Conveying pulverulent material



1936- I M. VOGEL-JORGENSEN 2,032,337

CONVEYING PULVERULENT MATERIAL Filed June 22, 1935 Patented Feb. 25,1936 UNITED. STATES CONVEYING PUIJVERULENT MATERIAL MikaelVogel-Jorgensem Copenhagen, Denmark, assignor to F. L. Smldth & 00., NewYork, N.-Y., a corporation of New Jersey Application June 22, 1935,Serial No.'27,87'l

3 In Great Britain July 6, 19 34 Claims. (01. 302-36) In Letters Patentof the United States No. 1,937,040, granted November 28,1933 to theassignee herein upon the application of the present applicant, there isshown and described an apparatus 5 for the conveying of pulverulent orgranular material which in the mass is more or less fluent, such ascement raw meal, cement, pulverized coal and the like, in which a fluidunder pressure, such as compressed air, is relied upon as the means bywhich movement'of the material throughaconduit is effected. When thematerialto be so conveyed is taken directly from the manufacturingapparatus or from a container in which it is stored and is fed into theconveying conduit there is a tendency oi the compressed air or othermotive fluid to escape back throughthe feeding mechanism. In theapparatus shown in said patent it was sought to prevent such escape ofair or other fluid by compacting the material in the path of suchpossible escape of the air. I The apparatus of the patent is effectiveto a degree in reducing the escape of air but for the handling of someclasses of material it'has been'i'ound desirable to provide meanswherebythe escape otair can be more effectivels prevented; The apparatusof thepresentinvention is generally simliar'to that shown in the patent,although modified in form, a valve or valves being provided in relationto the other parts of the apparatus and relied upon to prevent 30. theescape of air in place of the means for compacting the material. Suchvalve, which may have diiterent forms, yields to permit passage of thematerial from the rotating body into the chamber of the housing intowhich the motive fluid is admitted to provide the fluid pressure bywhich the material is moved on through the connected conveyingconduitand closes upon the rotating hollow body when the pressure within thehousing exceeds, the pressure developed'by the material under theinfluence of centrifugal force.

In the drawing, ,in which several different e'mbodiments of theinventionare illustrated- Figure 1 is a view in longitudinal, centralsection of one embodiment of the invention, a worm conveyor being shownasa means to supply the material from the hopper to the hollow rotatingbody. 7

Figure 2 is asimilar view of a diflferent embodiment of 'the inventionin which the movement of sufliciently represented by the Figure 4 is aview in transverse section on the. plane indicated by the broken line4-4 of Figure 3 a Figure 5 is a view generally similar to Figure 3,

but showing a. slightly diflerent form of valve. .5

V In the 'form of apparatus shown in Figure 1 the housing 20, somewhatlenticular in axial section and generallycircular in transverse,section,

has connected thereto at one point aconduitl through which the materialis conveyed from the 10 housing-- to the point of deposit. At anotherpoint of the housing there is connected the supply of compressed air orother fluid under pressure pipe 2.' The material to be conveyed is inthis instance assumed 15 to be placed in a hopper 4 from which it is fedby a worm. conveyor 3 to the interior of a hollow rotary body 5,lenticularin shape, having at one side a. dished wall 6 and at the otherside a plane wall I. In this: embodiment of the invention, an 9 Iannular valve 8, of rubber or other flexible material, is secured at itsinner edge to the wall I and may bear, at its free outer edge, againstthe wall 6 of the rotating hollow body. Inthis instance the wormconveyor 3-ls shown as rotated through a pulley 9 and the hollow body 5is shown as carried by a shaft Ill yvhich maybe rotated through a pulleyII). It be understood that, although the valve 8 may hangloosely whenthe apparatus is at rest, it will be caused by rapid rotation of thehollow body to which it is secured to stand at right angles thereto andthat its outer edge will then lie in close contact with the lip of thewall 6 of the hollow body. It will also be understood that thepressureoi the motive fluid within the housing 20 presses the valve against thewall 6 of the hollow body and efiectually prevents the escape of airfrom the chamber of the housing 20 into the hollow body and so preventsthe escape of the air through the feed device.-

Under the-influence of the centrifugal force developed by the rotationof the hollow body the material within the hollow body will be caused toa move outward between the valve 8 and the wall 6 into the chamber ofthe housing 20 from which it will be caused to move'by the pressure ofthe compressed air within such chamber outwardthrough the conveyingconduit l. Packing glands I l and I! may be provided as shown.

In the form of the apparatus shown in Figure 2 the housing 20, generallysimilar in shape to the housing shown inFigure 1, has connected theretoa conveying conduit l for the delivery of the material and a source ofair under pressure, indicated at 2. In this instance, the rotatinghollow body 5* is generally shaped like that shown in Figure 1, having adished wall 6 and at the other side a wall 1'. The material in thisinstance is fed to the interior of the hollow rotating body.

there is provided a transverse wall or partition i4 to prevent thematerial being drawn into the hollow shaft i5 through the port i6 whichcommunicates with the interior of the pipe IS. The

partition I may also be provided with vanes i1 to assist in throwing thematerial which passes from the end of the pipe i3 outward into thehollow body under the influence of the centrifugal force developed bythe rotation of the body. In this instance the valve 8 may be of thesame general character as that provided for the construction shown inFigure 1, being somewhat narrower by reason of the greater diameter ofthe fixed wall 1, but bearing at its outer edge, as before, against thewall ii" at or near its edge. The operation ofthis form of apparatus isthe same as that already described with respect to Figure 1 and need notbe further explained herein.

While in the construction shown in Figures 3 and g the hollow body 5* isrotated through the shaft Ill" and is connected through its hollow hub 5with the source of supply of the material it is shown in this instanceas formed with four radiating hollow arms l8 extended from the centralspace, each of such arms being shown as provided at its end with a rigidvalve ll pivoted at 20 and having a counterweight II to control itsaction. It will be understood that the rotating hollow body is placedwithin a suitably shaped housing which it is not necessary to show'since it functions in the same manner as does the housing shown inFigures 1 and 2.

The construction of the rotating hollow body 5 shown in Figure 5, issubstantially the same as that of the rotating hollow body shown inFigures 3 and 4, mounted ona rotating shaft ill and communicating withthe source of supply of material through the hollow hub 5. In thisinstance each valve 22 is shown as shaped to coact with the end of thearm iii to which it is applied, the

1 valve being pivotally mounted, as at 20, and provided with anadjustable counterweight 2 I The valves 22 are shaped as shown for thepurpose of facilitating the distribution of the material as it beingdrawn into the hollow shaft.

passes from the hollow rotating body into the chamber of the housingwithin which, as before, the hollow rotating body is placed.

It will be understood that various changes in details of constructionand arrangement can be made to suit. difierent conditions of use and,except as pointed out in the accompanying claims, the invention is notrestricted to any of the particular constructions shown and describedherein.

I claim as my invention: 1. In an apparatus for conveying pulverulentmaterial the combination of a housing, a con veying conduit connected tothe housing, means to supply fluid under pressure to the housing, ahollow body mounted within the housing, means to rotate the hollow body,means to supply the material to the hollow body at the central portionthereof, and a valve applied at the outer edge of the hollow bodyandadapted to yield outwardly under the influence of the pressuredeveloped by centrifugal .actionron the material within the hollow bodyand to be moved to closed position by pressure in the chamber of thehollow body.

2. In an apparatus for conveying pulverulent material, the combinationof a housing, a conveying conduit connected to the housing, means tosupply fluid under pressure to the housing, a hollow body mounted withinthe housing and having opposite walls, -a valve carried by one' of thewalls and adapted to cooperate with the other wall to prevent the escapeof air from the chamber of the housing, means to rotate the hollow body,and means to supply material to the hollow body at the central portionthereof.

low shaft communicating with the interior of the hollow body and inwhich a pressure diflerential is maintained, and a transverse wall isplaced within the hollow body to prevent the material 4. An apparatus asdescribed in claim 1, and

w in which an annular space is left between the edges of the two wallsand an annular flexible valve is secured at its inner edge to one of thewalls to cooperate at its outer edge with the other of the walls. 1

5. An apparatus as described in claim 1, and in which the hollow body isformed with radiating hollow arms with openings at their outer ends andin which valves yielding outwardly to pressure within the hollow, bodyand inwardly to pressure within the chamber of the housing are providedat the ends of the hollow arms.

" MIKAEL VOGEL-JORGENSEN.

